The housing comes out from the front, 6 bolts and 2 nuts. The top pipe slides into the housing (uses an o-ring), the lower one has a flange gasket. Have you tried prying (gently) between the rear flange plate and pump housing at the top. You can find service info at the link below.
http://oregonstate.edu/~tongt/camry
http://oregonstate.edu/~tongt/camry